A wide-field subcutaneous expander

Abstract

The present invention relates to a wide-field subcutaneous expander, which comprises a bottom plate, an inner tube and an outer tube fixedly arranged on the bottom plate, a sliding groove arranged between the outer tube and the inner tube, a first fixing piece and a second fixing piece integrally connected with the outer tube, an expansion tube sliding up and down in the sliding groove, a first connecting plate and a second connecting plate respectively arranged on both sides of the bottom of the expansion tube, and a first spreading piece and a second spreading piece respectively fixed on the first connecting plate and the second connecting plate; a slot for clamping the expansion tube is arranged on the top surface of the bottom plate, and both sides of the bottom of the expansion tube are connected with the first connecting plate and the second connecting plate in a slope tangent structure.

Description

Technical Field

[0001] The present invention relates to a wide - field subcutaneous dilator, which is applied in the field of medical surgery. Background Art

[0002] As is known, during minimally invasive surgeries such as spinal paravertebral or posterior thoracic paravertebral minimally invasive access system treatments, it is necessary to cut a hole in the human body and then expand the soft tissues at the cut hole to facilitate inserting surgical devices such as endoscopes into the affected area through the cut hole. Currently, most minimally invasive surgeries use a multi - stage dilating cannula to gradually expand the tissue. However, expanding the cut hole level by level results in a longer hole - expanding time, thereby prolonging the time of minimally invasive surgery. Moreover, the existing dilating cannulas usually adopt a round - tube structure. However, for patients, usually only a long - strip - shaped opening needs to be cut, and a long - strip - shaped cut hole is more convenient for postoperative suture. The diameter of the circular dilating cannula is wider than that of the long - strip - shaped incision, resulting in the actual area of the surgical cut hole for the patient being larger than the area required for the surgical operation, which is not conducive to minimizing the patient's physical injury and subsequent rehabilitation. Summary of the Invention

[0003] In order to solve the above - mentioned technical problems, the present invention provides a wide - field subcutaneous dilator, which can adjust the expansion of the surgical cut hole according to actual needs, without adding cannulas level by level, saving the hole - expanding time and reducing the injury to patients undergoing minimally invasive surgery.

[0004] The technical solution of the present invention is as follows:

[0005] A wide - field subcutaneous dilator includes a bottom plate, an inner tube and an outer tube fixedly arranged on the bottom plate, a sliding groove arranged between the outer tube and the inner tube, a first fixing piece and a second fixing piece integrally connected to the outer tube, a dilating tube sliding up and down in the sliding groove, a first connecting plate and a second connecting plate respectively arranged on both sides of the bottom of the dilating tube, and a first spreading piece and a second spreading piece respectively fixed on the first connecting plate and the second connecting plate; a slot for clamping the dilating tube is arranged on the top surface of the bottom plate, and both sides of the bottom of the dilating tube are connected to the first connecting plate and the second connecting plate in a slope - type tangent structure.

[0006] The bottom plate is an elliptical plate - like structure, and first limiting grooves and second limiting grooves for placing the first connecting plate and the second connecting plate are respectively arranged on both sides of the bottom plate. Both the first limiting groove and the second limiting groove are arc - shaped structures, and the first limiting groove and the second limiting groove are symmetrically arranged on both sides of the bottom plate.

[0007] A slot is arranged on the top surface of the bottom plate, and the slot is a circular - ring - type structure. The slot is disconnected at the first limiting groove and the second limiting groove, and the width of the slot is adapted to the thickness of the dilating tube.

[0008] Inside and outside the top surface of the slot, an inner tube and an outer tube are respectively provided. The inner tube is flush with the inner side of the slot, and the outer tube is flush with the outer side of the slot. The bottom surfaces of the inner tube and the outer tube are non-removably connected to the top surface of the bottom plate.

[0009] Both the inner tube and the outer tube are of elliptical tubular structures. The inner tube and the outer tube have the same height, and the width of the chute provided between the inner tube and the outer tube is greater than or equal to the thickness of the expansion tube.

[0010] On one side of the top surface of the outer tube, a first fixing piece and a second fixing piece are non-removably provided. Both the first fixing piece and the second fixing piece are of arc-shaped structures, and a fixing groove for clamping the first fixing piece and the second fixing piece is formed at the connection of the first fixing piece and the second fixing piece.

[0011] The expansion tube is of an elliptical tubular structure. The height of the expansion tube is greater than the height of the inner tube and the outer tube. An elliptical snap ring is provided at the top of the expansion tube. The snap ring extends outward from the top of the expansion tube, and the snap ring is non-removably connected to the expansion tube.

[0012] On both sides of the bottom surface of the expansion tube, they are both of ramp-shaped structures and the ramp surfaces gradually become lower from the outer wall to the inner wall of the expansion tube. The ramp surfaces on both sides of the bottom surface of the expansion tube are respectively adapted to the ramp surfaces of the first connecting plate and the second connecting plate.

[0013] Both the first connecting plate and the second connecting plate are of arc-shaped plate structures. The shapes and sizes of the first connecting plate and the second connecting plate are respectively adapted to the first limiting groove and the second limiting groove. Both the first connecting plate and the second connecting plate are connected to the expansion tube through connecting pieces, and the connecting pieces are made of elastic rigid materials.

[0014] The top surfaces of the first connecting plate and the second connecting plate are respectively non-removably connected to the bottom surfaces of the first spreading piece and the second spreading piece. The side wall surfaces of the first spreading piece and the second spreading piece are respectively perpendicular to the top surfaces of the first connecting plate and the second connecting plate. Both the first spreading piece and the second spreading piece are of arc-shaped structures, and the radian of the first spreading piece and the second spreading piece is adapted to the elliptical outer edge of the bottom plate.

[0015] The present invention has the following beneficial effects:

[0016] 1. When the present invention is in use, only need to use the fixing arm to fix the outer tube together with the inner tube, and then the expansion tube can be pushed according to the actual operation needs to adjust the size of the surgical incision expansion.

[0017] 2. By using the ramp-shaped tangential structure connection provided by the present invention between the expansion tube and the first connecting plate and the second connecting plate, when the expansion tube is pushed downward, the first connecting plate and the second connecting plate move toward both sides of the bottom plate, and further the first spreading piece and the second spreading piece move outward to expand the surgical incision.

[0018] 3. The bottom plate, inner tube, outer tube, and expansion tube provided by the present invention are all elliptical structures. Compared with circular structure sleeves, they are easier to place into the patient's incision hole, and the elliptical structure facilitates later suture.

[0019] 4. The advantage of the elliptical microchannel system is that, compared with the circular microchannel system, the elliptical microchannel system can extend the longitudinal surgical scope without increasing the damage between the articular process and the spinous process, thereby effectively protecting the paravertebral muscles in various types of surgeries such as long truncation of the spine, and has the unique advantage of being able to effectively handle the lesions within the spinal canal. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the bottom plate, inner tube, and outer tube in the present invention;

[0021] Figure 2 It is a schematic connection structure diagram of the expansion tube and the bottom plate in the present invention;

[0022] Figure 3 It is a sectional schematic connection structure diagram of the second connecting plate and the expansion tube in the present invention;

[0023] Figure 4 It is a top view structural diagram of the bottom plate in the present invention.

[0024] The reference signs in the drawings are shown as:

[0025] 1. Inner tube; 2. Slide groove; 3. First fixing piece; 4. Fixing groove; 5. Second fixing piece; 6. Outer tube; 7. Snap ring; 8. Expansion tube; 9. First spreading piece; 10. First connecting plate; 11. Bottom plate; 12. Second spreading piece; 13. Second connecting plate; 14. Connecting piece; 15. First limiting groove; 16. Slot; 17. Second limiting groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The present invention will be described in detail below with reference to the drawings and specific embodiments.

[0027] Refer to Figures 1 to 4 The described wide - field subcutaneous dilator includes a bottom plate 11, an inner tube 1 and an outer tube 6 fixedly arranged on the bottom plate 11, a slide groove 2 arranged between the outer tube 6 and the inner tube 1, a first fixing piece 3 and a second fixing piece 5 integrally connected with the outer tube 6, an expansion tube 8 sliding up and down in the slide groove 2, a first connecting plate 10 and a second connecting plate 13 respectively arranged on both sides of the bottom of the expansion tube 8, and a first spreading piece 9 and a second spreading piece 12 respectively fixed on the first connecting plate 10 and the second connecting plate 13; a slot 16 for clamping the expansion tube 8 is arranged on the top surface of the bottom plate 11, and both sides of the bottom of the expansion tube 8 are connected to the first connecting plate 10 and the second connecting plate 13 in a slope - type tangential structure.

[0028] The bottom plate 11 is an elliptical plate-like structure. On both sides of the bottom plate 11, a first limiting groove 15 and a second limiting groove 17 for placing the first connecting plate 10 and the second connecting plate 13 are respectively provided. Both the first limiting groove 15 and the second limiting groove 17 are arc-shaped structures, and the first limiting groove 15 and the second limiting groove 17 are symmetrically arranged on both sides of the bottom plate 11.

[0029] On the top surface of the bottom plate 11, a slot 16 is provided. The slot 16 is a circular ring-shaped structure. The slot 16 is disconnected at the first limiting groove 15 and the second limiting groove 17. The width of the slot 16 is adapted to the thickness of the expansion tube 8.

[0030] On the inner side and the outer side of the top surface of the slot 16, an inner tube 1 and an outer tube 6 are respectively provided. The inner tube 1 is flush with the inner side edge of the slot 16, and the outer tube 6 is flush with the outer side edge of the slot 16. The bottom surfaces of the inner tube 1 and the outer tube 6 are non-removably connected to the top surface of the bottom plate 11.

[0031] Both the inner tube 1 and the outer tube 6 are elliptical tubular structures. The inner tube 1 and the outer tube 6 have the same height. The width of the sliding groove 2 provided between the inner tube 1 and the outer tube 6 is greater than or equal to the thickness of the expansion tube 8.

[0032] On one side of the top surface of the outer tube 6, a first fixing piece 3 and a second fixing piece 5 are non-removably provided. Both the first fixing piece 3 and the second fixing piece 5 are arc-shaped structures. A fixing groove 4 for clamping the first fixing piece 3 and the second fixing piece 5 is formed at the connection of the first fixing piece 3 and the second fixing piece 5.

[0033] The expansion tube 8 is an elliptical tubular structure. The height of the expansion tube 8 is greater than the height of the inner tube 1 and the outer tube 6. An elliptical snap ring 7 is provided at the top of the expansion tube 8. The snap ring 7 extends outward from the top of the expansion tube 8. The snap ring 7 is non-removably connected to the expansion tube 8.

[0034] On both sides of the bottom surface of the expansion tube 8, the structures are both ramp-shaped and the ramp surfaces gradually become lower from the outer wall to the inner wall of the expansion tube 8. The ramp surfaces on both sides of the bottom surface of the expansion tube 8 are respectively adapted to the ramp surfaces of the first connecting plate 10 and the second connecting plate 13.

[0035] Both the first connecting plate 10 and the second connecting plate 13 are arc-shaped plate-like structures. The shapes and sizes of the first connecting plate 10 and the second connecting plate 13 are respectively adapted to the first limiting groove 15 and the second limiting groove 17. The first connecting plate 10 and the second connecting plate 13 are both connected to the expansion tube 8 through a connecting piece 14. The connecting piece 14 is made of an elastic rigid material.

[0036] The top surfaces of the first connecting plate 10 and the second connecting plate 13 are respectively non-detachably connected to the bottom surfaces of the first spreading piece 9 and the second spreading piece 12. The side wall surfaces of the first spreading piece 9 and the second spreading piece 12 are respectively perpendicular to the top surfaces of the first connecting plate 10 and the second connecting plate 13. Both the first spreading piece 9 and the second spreading piece 12 are arc-shaped structures, and the radian of the first spreading piece 9 and the second spreading piece 12 is adapted to the elliptical outer edge of the bottom plate 11.

[0037] The working principle of the present invention:

[0038] When using the present invention, first, insert the snake-shaped fixing arm into the fixing groove 4 to clamp the first fixing piece 3 and the second fixing piece 5, so that the outer tube 6 is fixed on the snake-shaped fixing arm, that is, the whole device is fixed on the snake-shaped fixing arm. After making a hole for the patient, adjust the angle of the snake-shaped fixing arm so that the bottom plate 11 first enters from the hole, place the bottom plate 11 at the bottom of the hole, and press the snap ring 7 at the top of the expansion tube 8, so that the expansion tube 8 moves downward from the chute 2 between the inner tube 1 and the outer tube 6. While the expansion tube 8 moves downward, the bottom of the expansion tube 8 is inserted into the slot 16 on the bottom plate 11. Furthermore, the bottom surfaces on both sides of the expansion tube 8 apply force to the first connecting plate 10 and the second connecting plate 13. The ramp-shaped structures of the first connecting plate 10 and the second connecting plate 13 cause the first connecting plate 10 and the second connecting plate 13 to move outward to the outside of both sides of the bottom plate 11 respectively after being stressed, so that the first spreading piece 9 and the second spreading piece 12 fixed on the first connecting plate 10 and the second connecting plate 13 expand the hole of the patient, facilitating further surgical operations; when the hole expansion is completed, lift the snap ring 7 upward, so that the expansion tube 8 gradually withdraws from the slot 16, and the expansion tube 8 moves upward in the chute 2. Under the action of the connecting piece 14, the first connecting plate 10 and the second connecting plate 13 simultaneously retract towards the center direction of the bottom plate 11, so that the first spreading piece 9 and the second spreading piece 12 are reset. Such a hole expansion method eliminates the way of adding sleeves level by level, saves the hole expansion time, and the elliptical microchannel system is more conducive to the doctor's surgical operation vision. It extends the longitudinal surgical scope without increasing the damage between the articular process and the spinous process, plays an effective role in protecting the paravertebral muscles for various types of surgeries such as long truncation of the spine, and has the unique advantage of being able to effectively handle the lesions in the spinal canal, which is beneficial to the patient's later rehabilitation.

[0039] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be included in the patent protection scope of the present invention by the same token.

Claims

1. A wide - field subcutaneous dilator, characterized in that: It includes a bottom plate (11), an inner tube (1) and an outer tube (6) fixedly arranged on the bottom plate (11), a chute (2) arranged between the outer tube (6) and the inner tube (1), a first fixing piece (3) and a second fixing piece (5) integrally connected with the outer tube (6), a dilating tube (8) sliding up and down in the chute (2), a first connecting plate (10) and a second connecting plate (13) respectively arranged on both sides of the bottom of the dilating tube (8), and a first spreading piece (9) and a second spreading piece (12) are respectively fixed on the first connecting plate (10) and the second connecting plate (13); a slot (16) for clamping the dilating tube (8) is arranged on the top surface of the bottom plate (11), and both sides of the bottom of the dilating tube (8) are connected with the first connecting plate (10) and the second connecting plate (13) in a slope - type tangential structure; when the dilating tube (8) is pushed downward, the first connecting plate (10) and the second connecting plate (13) move to both sides of the bottom plate (11), so that the first spreading piece (9) and the second spreading piece (12) move outward to expand the surgical incision; the bottom plate (11) is an elliptical plate - like structure, and first limiting grooves (15) and second limiting grooves (17) for placing the first connecting plate (10) and the second connecting plate (13) are respectively arranged on both sides of the bottom plate (11), both the first limiting groove (15) and the second limiting groove (17) are arc - shaped structures, and the first limiting groove (15) and the second limiting groove (17) are symmetrically arranged on both sides of the bottom plate (11); both the first connecting plate (10) and the second connecting plate (13) are arc - shaped plate - like structures, the shapes and sizes of the first connecting plate (10) and the second connecting plate (13) respectively match those of the first limiting groove (15) and the second limiting groove (17), and the first connecting plate (10) and the second connecting plate (13) are both connected with the dilating tube (8) through connecting pieces (14), and the connecting pieces (14) are made of elastic hard materials.

2. The wide - field subcutaneous dilator according to claim 1, characterized in that: A slot (16) is arranged on the top surface of the bottom plate (11), the slot (16) is a circular - ring - shaped structure, the slot (16) is disconnected at the first limiting groove (15) and the second limiting groove (17), and the width of the slot (16) matches the thickness of the dilating tube (8).

3. The wide - field subcutaneous dilator according to claim 2, characterized in that: An inner tube (1) and an outer tube (6) are respectively arranged on the inner side and the outer side of the top surface of the slot (16), the inner tube (1) is flush with the inner side edge of the slot (16), the outer tube (6) is flush with the outer side edge of the slot (16), and the bottom surfaces of the inner tube (1) and the outer tube (6) are non - detachably connected with the top surface of the bottom plate (11).

4. The wide - field subcutaneous dilator according to claim 3, characterized in that: The inner tube (1) and the outer tube (6) are both elliptical tubular structures. The inner tube (1) and the outer tube (6) have the same height. The width of the sliding groove (2) provided between the inner tube (1) and the outer tube (6) is greater than or equal to the thickness of the expansion tube (8).

5. A wide - field subcutaneous expander according to claim 4, characterized in that: One side of the top surface of the outer tube (6) is fixedly provided with a first fixing piece (3) and a second fixing piece (5) non - detachably. Both the first fixing piece (3) and the second fixing piece (5) are arc - shaped structures. A fixing groove (4) for clamping the first fixing piece (3) and the second fixing piece (5) is formed at the connection of the first fixing piece (3) and the second fixing piece (5).

6. A wide - field subcutaneous expander according to claim 4, characterized in that: The expansion tube (8) is an elliptical tubular structure. The height of the expansion tube (8) is greater than the height of the inner tube (1) and the outer tube (6). An elliptical snap ring (7) is provided at the top of the expansion tube (8). The snap ring (7) extends outward from the top of the expansion tube (8). The snap ring (7) is non - detachably connected to the expansion tube (8).

7. A wide - field subcutaneous expander according to claim 6, characterized in that: Both sides of the bottom surface of the expansion tube (8) are ramp - shaped structures and the ramp surfaces gradually become lower from the outer wall to the inner wall of the expansion tube (8). The ramp surfaces on both sides of the bottom surface of the expansion tube (8) are respectively adapted to the ramp surfaces of the first connecting plate (10) and the second connecting plate (13).

8. A wide - field subcutaneous expander according to claim 1, characterized in that: The top surfaces of the first connecting plate (10) and the second connecting plate (13) are respectively non - detachably connected to the bottom surfaces of the first spreading piece (9) and the second spreading piece (12). The side walls of the first spreading piece (9) and the second spreading piece (12) are respectively perpendicular to the top surfaces of the first connecting plate (10) and the second connecting plate (13). Both the first spreading piece (9) and the second spreading piece (12) are arc - shaped structures. The radian of the first spreading piece (9) and the second spreading piece (12) is adapted to the elliptical outer edge of the bottom plate (11).

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